Plotting curves with toggled sign

[massimo ceraolo]

Currently, OMEdit does not allow plotting mathematical elaboration of variables, such as sum or product of two variables, FFT, etc. I understand that adding this would require a strong effort and I'm not discussing it here.

However, there is one single operation that is, I think, by far the most useful that, I suppose should be added very easily: change of sign.
In fact, very often we have models in which two quantities should be very near to each other in absolute value, but opposite in sign. A graphical comparison of them would be greatly enhanced if one of them would be plotted with the opposite sign.

Just as an idea, we could exploit the fact that now right-clicking on the name of a curve in a plot does nothing. This could be used to toggle sign. The variable name should be displayed with the correct sign. For instance, Resistor.p.i, once toggled should read -Resistor.p.i

[Francesco Casella]

Retargeted to 1.17.0 after 1.16.0 release

[Francesco Casella]

Retargeted to 1.18.0 because of 1.17.0 timed release.

[Adeel Asghar]

Done in 97e53bb/OpenModelica.

[massimo ceraolo]

what's the way to toggle?

[Adeel Asghar]

Sorry I forgot to write that. Right click is used to open a context menu so I added it inside the setup window. Basically right click variable name in the legend and then select setup, inside the setup window you have a checkbox for Toggle Sign.

[Francesco Casella]

@adeas31, would you mind adding a short note about this in the ​documentation?

I'm not sure if this only works for time plots or also for parametric plots, please put this info in the appropriate position based on that.

Thanks!

[Adeel Asghar]

Sure. I will update the users guide.

[massimo ceraolo]

Ah, I see.

However, at present the context menu has now just one item (setup), which is a little wierd. A single-item menu is not optimal from the user-friendliness point of view. I mean, it requires without any need an extra click.

So, I propose one of the following two options:

• right-clicking gives immediate access to setup for the variable clicked on (in that case the checkbox would stay where you've just put)
• right clicking gives access to a real menu (not a single item). In this case, for the time being, we could have just two items: one (the first) is "toggle", the second "setup".

[Adeel Asghar]

See bba553f/OpenModelica.

Added Toggle Sign to context menu.
Updated users guide.

[massimo ceraolo]

This is exactly the behaviour I expected. I like it.

[massimo ceraolo]

This feature is faulty when re-simulating.
Consider Test.mo.
1) simulate
2) put on the same plot resistor.i and sineVoltage.i.
3) toggle sign of sineVoltage.i => the result is ok.
4) re-simulate: sine Voltage has not its sign reversed toggled, even though the name has a '-' on front of it.
5) if I open new plot and plot resistor.i and sineVoltage.i, sneVoltage is toggled, but the '-' sign is not in front of its name.
5) even if I simultae the model from scratch (without closing OMEdit) , the bad signs stay there

Expected behaviour:

• curves in existing plots should stay toggled
• curves in new plots should be untoggled.

[Adeel Asghar]

Fixed in bf2e73a/OpenModelica and also ported to 1.18